关键词: 断陷盆地, 复式含油气系统, 烃源岩, 生物标志物, 济阳坳陷

Abstract: The petroleum system of the faulted basins in the eastern China has the characteristics of multi-levels,in accordance with the basin structure and exploration degree.The basic unit of system is proposed to have single center of oil generating depression(or sag).The basis of multiple petroleum system is the existence of active source rocks of different geological ages in the basin.It's the result of activities of faulted-blocks with mullet-phase high geothermal field in the faulted basin.The occurrence and the distribution of petroleum systems in the basin are controlled by intensity and time of faulting activity.The petroleum systems can be defined by the oil-source correlation with the biomarkers.Taken the Zhanhua sag in the Jiyang depression as an example,the formation and characteristics of the multiple petroleum system are expounded.Three series of source rocks in the basin are the third member and fourth member of Shahejie formation of Eocene and the first member of Shahejie formation of Oligocene.Each of source rocks was deposited in the specific environment and experienced different evolutional stages,finally three kinds of crudeoil are generated.Attribute and maturity of crude oil are clearly displayed in their biomarker composition.There are three kinds of source rocks and three periods of pool formation in the multiple petroleum system of Eocene and Oligocene in the Jiyang Basin.These systems have own combination of the source-reservoir-caprock,migration path and distribution.They are superposed or intercalated in the geological space and have multi-phase in the geological ages.

Key words: faulted basin, multiple petroleum system, source rock, biomarker, Jiyang depression